@@ -64,16 +64,113 @@ the illustrated signal. This can even lead to that the input signal
...
@@ -64,16 +64,113 @@ the illustrated signal. This can even lead to that the input signal
is indicated in steps. This effect can be contracted when the
is indicated in steps. This effect can be contracted when the
memory depth is increased.
memory depth is increased.
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== Vertical Scaling
== Vertical Scaling
The calculation of the vertical scaling is closely linked to
The calculation of the vertical scaling is closely linked to
the analog front-end. In Equation 3, the parameter adcin is
the analog front-end. In Equation 3, the parameter adcin is
an 8-bit value. This value needs to be converted to a voltage
an 8-bit value. This value needs to be converted to a voltage
level value (vreal) to update the measurement fields in the
level value (Vreal) to update the measurement fields in the
GUI. The parameter adc0 is the virtual zero line of the ADC
GUI. The parameter adc0 is the virtual zero line of the ADC
and amounts to 133. The constant parameter adcValUp is the
and amounts to 133. The constant parameter adcValUp is the
maximum ADC value (195) before the input signal clips. The
maximum ADC value (195) before the input signal clips. The
parameter ampmax represents the maximum voltage level [Vp]
parameter ampmax represents the maximum voltage level [Vp]
of the corresponding amplification stage.
of the corresponding amplification stage.
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image::https://es.technikum-wien.at/openlab/openlab_wiki/wikis/img/SignalToolkit_Oscilloscope/SignalToolkit_Oscilloscope_Formula3.PNG[caption="Formula 3: ",title="Calculates the voltage level Vreal for updating the measurement fields",align="center"]
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Equation 4 is utilized to adjust the voltage level Vreal according
to the vertical position and scaling factor of the corresponding knobs. The signal graph of the GUI has 8
divisions on the y-axis.
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image::https://es.technikum-wien.at/openlab/openlab_wiki/wikis/img/SignalToolkit_Oscilloscope/SignalToolkit_Oscilloscope_Formula4.PNG[caption="Formula 4: ",title="Calculates the voltage level Vdisp for drawing the signal correctly on the graph",align="center"]
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The parameter pos0 is the virtual zero line of the GUI. The
addition of the parameter pos0 makes it possible to modify
the vertical position of the waveform. The parameter voltsdiv
is bound to the vertical scale knob. During the modification of
the vertical scale knob, the displayed waveform would enlarge
or reduce.
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== Sequential Equivalent Time Sampling Data Processing
The GUI has an essential purpose regarding the SETS data
processing. In case the maximum sample rate of the ADC
is exceeded, the development board needs to be informed
with additional instructions to start the SETS mode. These
instructions are calculated in the GUI and contain the required
sample rate, acquisition rounds, and acquisition packet size.
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Equation 5 is necessary to calculate the required sample rate
to process the input signal properly. The parameter SAframe
represents the maximum samples, which are illustrated within
one frame. In this case SAframe amounts to 600 samples.
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image::https://es.technikum-wien.at/openlab/openlab_wiki/wikis/img/SignalToolkit_Oscilloscope/SignalToolkit_Oscilloscope_Formula5.PNG[caption="Formula 5: ",title="Calculates the required sample rate in SETS",align="center"]
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Equation 6 is utilized to compute the required acquisition rounds.
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image::https://es.technikum-wien.at/openlab/openlab_wiki/wikis/img/SignalToolkit_Oscilloscope/SignalToolkit_Oscilloscope_Formula6.PNG[caption="Formula 6: ",title="Calculates the required acquisition rounds in SETS",align="center"]
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The acquisition packet size consists of the division of
SAframe and the maximum sample rate SRADJ . Figure 6
illustrates an example of the reconstruction of one SETS
sample packet. In this example the adjusted sample rate
in the GUI was set to 10 MSa/s (delta x). Thus, the required
acquisition rounds amount to 4 rounds, whereas one packet
consists of 150 sample values.
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The GUI stores every single received sample packet temporarily
until all acquired packets are available. The signal
graph in Figure 6 highlights the sample process as a function
of time. Due to the fact that the maximum sample rate is
limited, the input signal needs to be sampled over more than
one acquisition round. In this example, four time periods
are necessary to sample the input signal according to the
SETS technique. In Figure 6, the parameter delta y represents
The signal graph of the GUI is only updated when all acquired sample packets are available.
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== https://es.technikum-wien.at/openlab/openlab_wiki/wikis/home[Home] | https://es.technikum-wien.at/openlab/openlab_wiki/wikis/project_des[<Project Description] | https://es.technikum-wien.at/openlab/openlab_wiki/wikis/SOTA_osci[State of the Art Research (Oscilloscope)>]
== https://es.technikum-wien.at/openlab/openlab_wiki/wikis/home[Home] | https://es.technikum-wien.at/openlab/openlab_wiki/wikis/project_des[<Project Description] | https://es.technikum-wien.at/openlab/openlab_wiki/wikis/SOTA_osci[State of the Art Research (Oscilloscope)>]
